请查看代码段
while ($rslt = fetch_array($result))
{
//$row++;
if (bccomp ($row, $row_limit, 0) != 1)
{
/*HEADER*/
if ($row == 0)
{
foreach ($_SESSION['market']['data'] as $title => $field)
{
//Output Header Cell
//$title++;
$worksheet->write ($row, $col, title,$formatHeader);
//Advance Column
$col++;
}
}
//Reset Column Position
$col = 0;
//Advance Row
$row++;
}
/*BODY*/
foreach ($_SESSION['market']['data'] as $title => $field)
{
//Output Body Cell
$worksheet->write ($row, $col, $rslt[$field], $formatNormal);
//Advance Column
$col++;
}
//Reset Column Position
$col = 0;
//Advance Row
$row++;
}
}
它的工作完全正常,我很满意。但现在要求是:在每一行的第0列有一个名称,并且就该名称还有其他字段,现在我想做的是比较每一行的第0列,问题是如何存储前一行的第0列。逻辑就像($ rslt ['name'] === $ rslt [// previous column name])。 请把我解雇。
答案 0 :(得分:2)
您无法使用state
别名。您必须重复IFNULL()
表达式:
... CONCAT(a, aa, IFNULL((SELECT p.name FROM p WHERE p.id = x.name), 'N.A.'))
此外,我认为您的意思是CONCAT()
而不是CONCATE()
。另请注意,N.A.
应包含在单引号中:'N.A.'
。
测试用例:
SELECT CONCAT('1-', '2-', IFNULL((SELECT NULL), 'N.A.'));
+---------------------------------------------------+
| CONCAT('1-', '2-', IFNULL((SELECT NULL), 'N.A.')) |
+---------------------------------------------------+
| 1-2-N.A. |
+---------------------------------------------------+
1 row in set (0.00 sec)
SELECT CONCAT('1-', '2-', IFNULL((SELECT 3), 'N.A.'));
+------------------------------------------------+
| CONCAT('1-', '2-', IFNULL((SELECT 3), 'N.A.')) |
+------------------------------------------------+
| 1-2-3 |
+------------------------------------------------+
1 row in set (0.00 sec)